2X69

X-ray Structure of Macrophage Inflammatory Protein-1 alpha polymer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.235 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Polymerization of Mip-1 Chemokine (Ccl3 and Ccl4) and Clearance of Mip-1 by Insulin-Degrading Enzyme.

Ren, M.Guo, Q.Guo, L.Lenz, M.Qian, F.Koenen, R.R.Xu, H.Schilling, A.B.Weber, C.Ye, R.D.Dinner, A.R.Tang, W.

(2010) EMBO J 29: 3952

  • DOI: 10.1038/emboj.2010.256
  • Primary Citation of Related Structures:  
    2X6L, 2X6G, 2X69

  • PubMed Abstract: 
  • Macrophage inflammatory protein-1 (MIP-1), MIP-1α (CCL3) and MIP-1β (CCL4) are chemokines crucial for immune responses towards infection and inflammation. Both MIP-1α and MIP-1β form high-molecular-weight aggregates. Our crystal structures reveal that MIP-1 aggregation is a polymerization process and human MIP-1α and MIP-1β form rod-shaped, double-helical polymers ...

    Macrophage inflammatory protein-1 (MIP-1), MIP-1α (CCL3) and MIP-1β (CCL4) are chemokines crucial for immune responses towards infection and inflammation. Both MIP-1α and MIP-1β form high-molecular-weight aggregates. Our crystal structures reveal that MIP-1 aggregation is a polymerization process and human MIP-1α and MIP-1β form rod-shaped, double-helical polymers. Biophysical analyses and mathematical modelling show that MIP-1 reversibly forms a polydisperse distribution of rod-shaped polymers in solution. Polymerization buries receptor-binding sites of MIP-1α, thus depolymerization mutations enhance MIP-1α to arrest monocytes onto activated human endothelium. However, same depolymerization mutations render MIP-1α ineffective in mouse peritoneal cell recruitment. Mathematical modelling reveals that, for a long-range chemotaxis of MIP-1, polymerization could protect MIP-1 from proteases that selectively degrade monomeric MIP-1. Insulin-degrading enzyme (IDE) is identified as such a protease and decreased expression of IDE leads to elevated MIP-1 levels in microglial cells. Our structural and proteomic studies offer a molecular basis for selective degradation of MIP-1. The regulated MIP-1 polymerization and selective inactivation of MIP-1 monomers by IDE could aid in controlling the MIP-1 chemotactic gradient for immune surveillance.


    Organizational Affiliation

    Ben-May Department for Cancer Research, The University of Chicago, Chicago, IL 60637, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
C-C MOTIF CHEMOKINE 3A, B, C, D, E70Homo sapiensMutation(s): 0 
Gene Names: CCL3G0S19-1MIP1ASCYA3
UniProt & NIH Common Fund Data Resources
Find proteins for P10147 (Homo sapiens)
Explore P10147 
Go to UniProtKB:  P10147
PHAROS:  P10147
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.235 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 181.541α = 90
b = 181.541β = 90
c = 76.845γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-03
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance